Make the manpage consistent with the code on the subject of comments, as to not change the code to always do the "GNU" thing, as it's possible people rely on BSD m4(1) traditionally resetting comment characters in case of no arguments to the changecom function.
Make the manpage consistent with the code on the subject of comments, as to
not change the code to always do the "GNU" thing, as it's possible people
rely on BSD m4(1) traditionally resetting comment characters in case of no
arguments to the changecom function.

PR:	bin/17480 (I think this satisfies the problem report)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase